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I'm trying to mix-in a class in my Groovy/Grails app, and I'm using the syntax defined in the docs , but I keep getting an error. I have a domain class that looks like this: class Person { mixin(ImagesMixin) // ... } It compiles fine, but for some reason it won't work. The file containing ImagesMixin is located in my /src/groovy/ directory. I've tried it using Groovy versions 1.5.7 and 1.6-RC1 without any luck. Does anyone know what I'm doing wrong? stacktrace: 2008-12-30 17:58:25.258::WARN: Failed startup of context org.mortbay.jetty.webapp.WebAppContext@562791{/FinalTransmission,/home/kuccello/Development/workspaces/lifeforce/FinalTransmission/web-app} org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'pluginManager' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.ExceptionInInitializerError at java.security.AccessController.doPrivileged(Native Method) at RunApp_groovy$_run_closure2_closure7.doCall(RunApp_groovy:67) at RunApp_groovy$_run_closure2_closure7.doCall(RunApp_groovy) at Init_groovy$_run_closure6.doCall(Init_groovy:131) at RunApp_groovy$_run_closure2.doCall(RunApp_groovy:66) at RunApp_groovy$_run_closure2.doCall(RunApp_groovy) at RunApp_groovy$_run_closure1.doCall(RunApp_groovy:57) at RunApp_groovy$_run_closure1.doCall(RunApp_groovy) at gant.Gant.dispatch(Gant.groovy:271) at gant.Gant.this$2$dispatch(Gant.groovy) at gant.Gant.invokeMethod(Gant.groovy) at gant.Gant.processTargets(Gant.groovy:436) at gant.Gant.processArgs(Gant.groovy:372) Caused by: java.lang.ExceptionInInitializerError at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at Episode

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